Unprecedented selective homogeneous cobalt-catalysed reductive alkoxylation of cyclic imides under mild conditions
作者:Jose R. Cabrero-Antonino、Rosa Adam、Veronica Papa、Mattes Holsten、Kathrin Junge、Matthias Beller
DOI:10.1039/c7sc01175j
日期:——
metal-catalysed reductive C2-alkoxylation of cyclicimides (phthalimides and succinimides) is presented. Crucial for the success is the use of [Co(BF4)2·6H2O/triphos (L1)] combination and no external additives are required. Using the optimal cobalt-system, the hydrogenation of the aromatic ring of the parent phthalimide is avoided and only one of the carbonyl groups is selectively functionalized. The
提出了第一个通用且有效的非贵金属催化的环状酰亚胺(邻苯二甲酰亚胺和琥珀酰亚胺)的还原性C2-烷氧基化反应。成功的关键是使用[Co(BF 4)2 ·6H 2 O / triphos(L1)]的组合,并且不需要外部添加剂。使用最佳的钴系统,避免了母体邻苯二甲酰亚胺的芳环的氢化,并且仅羰基中的一个被选择性地官能化。所得的产物,N-和芳基环取代的3-烷氧基-2,3-二氢-1H-异吲哚-1-酮和N-取代的3-烷氧基-吡咯烷基-2-酮衍生物是在温和的条件下以良好至优异的分离产率制备的。分子内还原偶联也可以在一步法中进行,从而得到三环化合物。本协议为药物和生物学关注的功能化N杂环化合物的直接合成开辟了新的贱金属工艺开发途径。
Substituent chemical shifts of<i>N</i>-arylsuccinanilic acids,<i>N</i>-arylsuccinimides,<i>N</i>-arylmaleanilic acids, and<i>N</i>-arylmaleimides
作者:Hye Sun Lee、Ji Sook Yu、Chang Kiu Lee
DOI:10.1002/mrc.2450
日期:2009.9
NMR spectra of a series of N-arylsuccinanilic acids, N-arylsuccinimides, N-arylmaleanilicacids, and N-arylmaleimides were examined to estimate the electronic effect of the amide and imide groups on the chemicalshifts of the hydrogen and carbon nuclei of the benzene ring.
A novel base-promoted domino Michael/O-alkylation reaction of maleimides with γ-halogenated-β-ketoesters is described. A variety of new succinimide-substituted 3(2H)-furanones were obtained in excellent yields (up to 96%) under simple and mild conditions. The structure of the new compound 3a was determined by singlecrystal X-ray analysis and a reaction pathway is proposed.